how can i write functions in String class without using any tools?

[Paul Conrad]

Christian Graus wrote:

always for students writing a list class that they will never use

Sure, it primes them up for writing code that never gets used because boss says otherwise, and writing something like a list class teaches the fundamentals of OOP.

Christian Graus wrote:

they should be learning things they can use

Exactly, since they will walk out of the classroom with, hopefully sharper skillsets that can be of value to them. I've had students in the past, who earned lower than average grades thank me for increasing their skillsets, though their academic grade doesn't necessarily reflect it.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer "Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

[Christian Graus]

Oh, I hate it when people do that...

Christian Graus Please read this if you don't understand the answer I've given you. If you're still stuck, ask me for more information.

[Christian Graus]

I think you need to re-read the assignment. You seem to be saying 'turn a string into a byte array without using any methods on the string class that would give you access to the contents of the string'.

Christian Graus Please read this if you don't understand the answer I've given you. If you're still stuck, ask me for more information.

[Paul Conrad]

Oh well, no worries :-D

"The clue train passed his station without stopping." - John Simmons / outlaw programmer "Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

[Lost User]

:laugh:

[Paul Conrad]

I'll admit I have some code that is a maintenance nightmare, considered "job security" to a certain extent :rolleyes:

"The clue train passed his station without stopping." - John Simmons / outlaw programmer "Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

[Guffa]

Without using the built in members of the String class, you can't access it's data.

Despite everything, the person most likely to be fooling you next is yourself.

[Dave Kreskowiak]

Why does it have to be "or"?? Why not "and"?? ;)

A guide to posting questions on CodeProject[^]
Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
     2006, 2007, 2008

[PIEBALDconsult]

I was just wondering whether or not you can with unsafe code... could be fun... :suss: Howsabout this :-D :

private unsafe static void
F
(
string S
,
out char[] A
)
{
int index = 0 ;

fixed ( char\* s = S )
{
    while ( s \[ index \] != '\\0' )
    {
        index++ ;
    }

    A = new char \[ index \] ;

    fixed ( char\* a = A )
    {
        while ( index >= 0 )
        {
            a \[ index \] = s \[ index \] ;

            index-- ;
        }
    }
}

return ;

}

Or lambda expressions?

modified on Monday, July 7, 2008 11:47 PM

[PIEBALDconsult]

It could be an exercise intended to show that it can't be done. But probably it's poor communication.

[PIEBALDconsult]

Here are Left and Right Trim methods that don't access any methods of the String class, but I hope this isn't what the teacher is expecting.

private unsafe static void
LeftTrim
(
string Subject
,
System.Collections.Generic.HashSet<char> Chars
)
{
fixed ( char* subject = Subject )
{
int* length = (int*) subject - 1 ;
int front = 0 ;
int back = 0 ;

    while
    (
        ( front < \*length )
    &&
        ( Chars.Contains ( \*(subject + front) ) )
    )
    {
        front++ ;
    }

    while ( front < \*length )
    {
        \*(subject + back++) = \*(subject + front++) ;
    }

    \*length = back ;
}

return ;

}

private unsafe static void
RightTrim
(
string Subject
,
System.Collections.Generic.HashSet<char> Chars
)
{
fixed ( char* subject = Subject )
{
int* length = (int*) subject - 1 ;

    while
    (
        ( \*length >= 0 )
    &&
        ( Chars.Contains ( \*(subject + \*length - 1) ) )
    )
    {
        (\*length)-- ;
    }
}

return ;

}